| Brazil U20 League | 2021/10/11 18:00 | Uniao Harmonia U20 v Atletico Clube Sulbrasil U20 | W | 0-6 |
| Brazil U20 League | 2021/10/04 18:00 | Atletico Clube Sulbrasil U20 v SC Jau U20 | W | 2-1 |
| Brazil U20 League | 2021/09/28 18:00 | Sao Gabriel U20 v Atletico Clube Sulbrasil U20 | W | 0-1 |
| Brazil U20 League | 2021/09/12 18:00 | Atletico Clube Sulbrasil U20 v SC Doze Horas U20 | W | 2-1 |
| Brazil U20 Cup | 2021/07/10 13:00 | Cruzeiro RS U20 v Atletico Clube Sulbrasil U20 | L | 4-2 |
| Brazil U20 Cup | 2021/06/21 18:00 | CE Bento Goncalves RS U20 v Atletico Clube Sulbrasil U20 | L | 2-0 |
| Brazil U20 Cup | 2021/06/12 18:30 | APAFUT U20 v Atletico Clube Sulbrasil U20 | D | 1-1 |
| Brazil U20 League | 2021/10/05 18:00 | Riopardense U20 v Uniao Harmonia U20 | D | 1-1 |
| Brazil U20 League | 2021/09/20 18:00 | Riopardense U20 v Sao Gabriel U20 | W | 3-2 |